WOFileUpload, Apache and large file

Hello,

I have an application which accepts file uploads using WOFileUpload. It's 
deployed on Linux (WO5.2) and uses the default adaptor and Apache as the 
Web server. The WOFileUpload uses the outputStream binding so the file 
data goes to disk and this normally works fine.

This morning a customer uploaded a large file which took a long time to 
upload (59 mins). During this time, all other users with sessions in the 
same app instance were "locked out" (received various http errors (500 
etc) to the effect that the app was unavailable). I deduce that this is 
because the app only has 1 tcp connection to Apache which is exclusively 
used by the file data.

Has anyone encountered this problem before? Is there any way round it? 
I've created a few more instances so fewer users should now be affected by 
it if it happens again (but most file uploads are much smaller and quicker 
anyway). But I'd like to know if there's a better fix.

best regards, John Escott.